The OP said something about how the human body doesn't make "intelligent" decisions.
I was being cheeky, not using the best word for the job.
Evolution is not really passive, it's a combination of mutation (which is not intelligent, but not really passive) PLUS a passive filter, which gives the illusion of intelligence since it ends up as a kind of optimiser.
Now, due to various factors, evolution isn't perfect. For gene expression reasons (I think) the layout of mammal skeletons are not really effected much mutations, but bone sizes are; so you have giraffes with huge neck bones that are the same size as human neck bones (this isn't the best way to do it). You have bats with the same finger bones as humans (or at least very similar) acting as wings. Elephant feet are almost the same as human feet in an x-ray. Some genetic "knobs" are easier to turn than others, and it can be that shrinking something is easier than getting rid of it. Just google "vestigial structure". Actually, LLM are kind of similar (it's easier to optimise a value to zero than to remove it, even if removing a value will make the model better and faster).
It's also more adaptative than optimal. Some argue it's the "selfish gene" that "wants" to be passed on. If a gene makes you kill all the competition, that's a "fit" gene. If working in a team increases the survival rate of your cousins (who also kind of carry your genes) it's "fit". If having a certain percent of a village be gay would somehow increase survival rates (especially of their kin) then having a chance of being gay is "fit" even if the individuals themselves could be less likely to reproduce.
There's also some meta stuff about how the rate of mutations could partly be genetic.
Evolution is seen as intelligence because it solves hard problems, and IMO that's kind of the only thing intelligence needs? People who talk about "consciousness" talk a lot about how they think they think, but is how we think actually an illusion? The feeling of understanding is just a chemical pleasure hit when the brain hits the "problem solved" button. Consciousness might be an illusion, we might make a decision and wonder how we made it, then an AI in our brain quickly justifies it in some BS way that isn't actually our real thinking process.